package com.guigu.springboot.component;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *  登录检查
 *
 * @author: kaiyi
 * @create: 2020-08-04 00:37
 */

public class LoginHandlerInterceptor implements HandlerInterceptor {

 // 目标方法执行前
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

    Object user = request.getSession().getAttribute("loginUser");
    if(user == null){
      // 未登录，返回登录页面
      request.setAttribute("msg", "没有权限请先登录");
      request.getRequestDispatcher("/index.html");
      return false;
    }else{
      // 已登录，放行请求
      return true;
    }
  }

  @Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
      ModelAndView modelAndView) throws Exception {

  }

  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
      throws Exception {

  }
}
